Hydraulic pipe vise



April 25, 1961 M. E. MITCHELL 2,981,131

HYDRAULIC PIPE VISE Filed Oct. 15, 1959 2 Sheets-Sheet 1 IN VEN TOR.

M91. COLM EMTCHEL L April 25, 1961 M. E. MITCHELL HYDRAULIC PIPE VISEFiled Oct. 15, 1959 2 Sheets-Sheet 2 INVENTOR.

[ l/71.00441 1 MTCHELL e i 2,981,13t Patented. Apr. 25, 19.61

United States Patent HYDRAULIC PIPE VISE MalcolmEaMitchell, 120 E.109thPlace,

Los Angeles, Calif.

Filed Oct-1.5, 1959, Ser. No. 846,695

8jClain1s. (Cl 81.-17.2)

I'his inventionrelatesto avise and is more-particularly concerned with aportable hydraulically operated pipe vise. In all pipe fitting andplumbing operations and installations, it is necessarythat pipe be cutand. otherwise workedupon. Itis necessary inmany such situations thatthe pipe be held securely in a suitable vise.

It is commonpractice for pipe fitters, plumbers and the like, to cut andprefabricate as much of an installation as possible, at a shop, wheresuitable and/or adequatafast easy to operate VlSfiS are; available andto transport the prefabricated portions of the installations to the jobsite and tothereafter install it.

While small manually operated pipe vises arefrequently-available at thejobsites, workmen of the class referred to generally avoid using them.as much as possible, since they areslowand difficult tooperate-and-aregenerally not sufiiciently strong andssturdy toafiord thesup port desired.

An object of my inventionis to providea unitary pipe vise that canbeadvantageously transported from, one placeto another with a minimum ofeffort.

It is an object of my invention to provide a novel manually operated,hydraulically actuated pipe vise which is such that it canadvantageously accommodate pipes of varying size and such that itcan-exert great pressure thereon.

A further object of my invention is to provide a vise of, the characterreferred to which is fastvand which requires little or no skill tooperate.

It is a feature ofmy-inventiontto provide. a-viseof the characterreferred to having. arigidframe, a-'fixed jaw on the frame, a movable,jaw'pivotally-carriedby the frame and a hydraulic cylinder andpistonunit carried by the frameto oppose the fixed jaw andcoupled with themovable jaw.

Another feature of my inventionis to provide. a vise of the characterreferred to having a manually operated hydraulic pump to deliver fluidtothe cylinderand piston unit and a manually operable means for shifting;the movable jaw relative to thefi-xedjaw and into and out of engagementwith a pipe engaged in the fixed jaw.-

Still another. feature of my inventionis to provide a manually operablevalve meansto control the flow; of fluid to and from the cylinder andpiston unit.

An object of this invention is to provide, a vise construction of thecharacter referred to which is .easy and economical to manufacture andwhich is both highlyeffective and dependable in operation.

The various objects and features of my invention will be fullyunderstood from the following detailed description of a typicalpreferred form and application of my invention, throughout whichdescription reference is made to the accompanying drawings, in which:

Fig. 1 is a side view of my new vise constructionshowing certain partsin section.

Fig. 2* is a front view-of rny new construction, with partsthereof insection.-

Fig. 3 is an enlarged detailed sectional view of a portion of thestructure shown in Fig. 1.

Fig. 4 is a sectional view taken as indicated by line 4-4 on Fig. 2.

The vise construction that I provide involves generally, a frame A, afixed jaw B carried by the frame, a movable jaw C, support means D forthejaw C, a hydraulic cylinder and piston unit E carried by the frameand operatively connected with the movable jaw C, a fluid reservoir Rcarried by the frame, a manually operable valve means V controlling theflow of fluid into and out of the cylinder and piston unit, manuallyoperable. pump means P related to the reservoir and the valve means tourge fluid into the said unit, fluid retaining means F between valvemeans and the reservoir, and manually operable shifting means G adaptedto urge the jaw C into and out of engagement with a pipe P engaged inthe jaw B, preparatory or subsequent to operation of the means V and P,

The frame A that I provide includes an elongate, horizontally disposedbase 10 having front and rear ends, an elongate horizontally disposedheader 11 having front and rear ends spaced above the base 10, a pair oflaterally spaced vertically disposed rear standards 12 fixed to andextending between the rear ends of the base and header 10 and 11 and apair of laterally spaced vertically disposed front standards 13 fixed toand extending between the base and the header and spaced rearward of thefront ends thereof.

The base ltlfis' shown established from a length 'of channel iron,arranged in'an inverted position so as to establish a flat top surface14.

The header 11 is formed of a simple length of strap steel or bar stock,and the standards 12 and 13 are formed of angle iron stock.

In addition to the foregoing, the frame A can, as illustrated, beprovided with vertically spaced, horizontally disposed, reinforcingspreaders 15 to extend between the standards 12 and 13, and spacers 16to extend between the adjacent standards.

In practice, the several parts going to make up the frame A are suitablysecured together in fixed relationship as by welding.

The fixed jaw B is a simple, cast block having a fiat bottom 17 to seaton the top 14 of the base 10, vertical sides 18 and a top having twodownwardly convergent wickered surfaces defining a pipe receivingtrough. The

jaw is arranged on the top 14 of the base, forward of thefront standards13 and so the trough extends transversely of the base.

The jaw B is releasably secured to the base by a pair of cleats 19arranged at opposite sides of the jaw to engage outwardly projectingbosses 20 provided on the adjacent sides of the jaw, and bolt fasteners21 carried by the cleats and engaged in the base.

The movable jaw C includes an elongate, horizontally disposed body 22having a downwardly opening, longitudinal groove 23 in its bottom sideand an upwardly projecting, block-like boss 24 with a longitudinallydisposed, transverse opening on its upper side. A pair of elongateblades 25 are arranged in the groove 23 to extend longitudinally thereofand to project downwardly therefrom.

The blades 25 are provided with inclined bottom sides 26 defininglaterally spaced, longitudinally disposed pipe engaging edges 27 andwhich are arranged to converge upwardly relative to each other anddefine a downwardly opening pipe receiving channel.

The jaw C is arranged to occur above and oppose the fixed jaw B.

The support means D for the jaw C includes aninverted, U-shaped yoke28"having a top body 29 and a pair of laterally space d depending legs30. The legs 30 occur at opposite sides of the boss 24 on the jaw C andare pivotally connected therewith by means of a pivot pin 31 engagedthrough the legs and through the opening in the boss. The pin isprovided with suitable lock nuts 32 at its opposite end to prevent itsdisplacement.

' The means D further includes an elongate carrier arm 33 having a frontend engaged between the legs 30 of the yoke 28, above the jaw, by meansof a pivot pin 34.

lateral shifting and displacement of the jaw C, relative to the jaw Band base A.

The cylinder and piston unit E includes an elongate, substantiallyvertically disposed cylinder sleeve 36, a head 37 at and closing itsupper end and a head 38 at and closing its lower end. The upper andlower heads 37 and 38 have cylindrical projections 39 to enter theadjacent ends of the sleeve 36 to maintain the heads properly oriented.The projections 39 are provided with suitable O-rings 40 to establish asuitable fluid seal between the heads and the cylinder sleeve.

The heads 37 and 38 are held in tight clamped engagement with the sleeve36 by a plurality of tie bolts 41.

A disc-shaped piston 42 carrying an O-ring seal 43 is engaged in thecylinder sleeve 36 and is connected with a piston rod 44 which dependstherefrom, through an opening provided in the lower cylinder head 38,and to a point where it connects with the yoke 28 of the means D. a

In the case illustrated, the lower end of the rod is threadedly engagedin an opening provided in the body of the yoke and carries a suitablelock nut 45 to engage the said body and to normally preventdisengagement of the rod therefrom.

The upper head 37 of the unit E is a cast part having a lower portionwhich engages the cylinder sleeve and is provided with the projection39, referred to above, a central body portion establishing a body 46 forthe valve ieans V, as will hereinafter be described and a top portion 47in the nature of a clevis and adapted to receive the forward end of theheader 11. The top portion or clevis 47 is pivotally secured to theheader 11 by means of a suitable pivot pin 47.

The central body portion 46 of the head 37 has a forwardly opening borein which a cylindrical valve plug 48 is engaged, an inlet port 49entering the body from one side and communicating with the bore and anoutlet port 50 entering the body from the other side and communicatingwith the bore, and a central vertical flow port 51 establishingcommunication between the interior of the cylinder and the bore. Theplug 48 is inder head 38 by screw fasteners 57 and having an elongateforwardly and upwardly opening channel 58. An elongate rack 59 slidablyengaged in the channel, a shaft 60 rotatably carried by the block, abovethe rack, to extend transversely of the channel and carrying a pinion 61to engage the channel, an elongate operating lever 62 suitably securedto one side of the pinion to project forwardly and upwardly therefromand provided with a hand engaging knob 63 at its outer terminal end, anelongate cylinder 64 threadedly engaged in an opening 65 in the rear endof the block and in axial alignment with the channel and the rack, a ram66 carried by the rack to project rearwardly therefrom and slidablyengaged in the cylinder, a nipple 67 threadedly engaged in the rear endof the cylinder and a suitable flow control means 68 connected with thenipple.

The flow control means 68 and shown in detail in Fig. 3 of the drawings,is a fabricated unit made up of three body sections 70,71 and72'ar'ranged in vertical stacked relationship and'clamped together bymeans of end plates 73 and the bolt 73'. The lower section 70 has acentral inlet opening 74 and an upwardly disposed valve seat 75concentric with the opening and adapted to cooperatively receive aninlet ball check 76. The central section 71 has a central bore 77, adownwardly opening socket 78 concentric with the bore to oppose thesection 70 and freely accommodate the ball check, a lateral port 79communieating with the socket and threadedly receiving the nipple 67 andan upwardly disposed annular valve seat 80 at its top, concentric withthe bore and adapted to cooperatively receive an outlet ball check 81.The upper section 72 has a central outlet opening 82 entering it fromthe top 'and a downwardly opening socket 83 concentric with the providedwith a flow passage 52 with ends opening at 90 about the periphery ofthe plug and adapted to be selectively positioned, upon rotation of theplug through 90, to establish communication between the inlet port andthe flow port, and between the outlet port and the flow port.

The plug can be retained in proper working position and againstdisplacement from the bore and can be suitably sealed therein in anydesired manner and is provided with a forwardly projecting operating'stem '53 carrying an operating lever arm 54. The stem 53 can, asillustrated, be provided with a suitable stop pin 55, or the like, toengage a part of the head 37tand stop the plug in predetermined rotativepositions where the ports in the body and the head are in register witheach other.

.The manually operable pump means P that I provide includes a cast guideblock 56secured to the lower cylopening 82 and freely receiving the ballcheck 81.

The sockets 78 and 83 are provided with suitable stop pins 84 to limitupwardly movement of the ball checks 76 and 81.

Suitable seals 85 are provided between the sections 70, 71 and 72 toprevent the escape of fluid therebetween.

The inlet opening 74 of the means 68 threadedly receives the end of aflow pipe 86 extending to and communicating with the reservoir R.

The outlet opening 82 of the means 68 threadedly receives an end of adelivery pipe 87 which extends to and is. engaged in the inlet port 49of the valve means V.

With the pump means P set forth above and illustrated in the drawings,it will be apparent that when the ram 66 is reciproeated in the cylinder64 by means of the rack and pinion drive, fluid is drawn from thereservoir R through the flow pipe 86 and into the means 68 and thecylinder 64 is urged under pressure from the cylinder and the means .68,through the delivery pipe 87 to the valve means V whereupon it isdirected into the cylinder 36, to urge the piston 42 and the movable jaw22, operatively related thereto, downwardly.

The reservoir R is a simple, vertically disposed cylindrical tank and isprovided at its bottom with a,T-fitting 88 to connect with a return pipe89 of the return means F. The reservoir is supported by the pipes 86 and89 through the T-fittin'g 88 and is free to pivot or swing with thecylinder and piston unit. 7

In practice, flexible conduits could be used in place of the severalpipes mentioned, in which case the reservoir R would be fixed to andsupported by the frame A.

The means F is adapted to provide for free fiow of fluid from thecylinder and piston unit E into the reservoir R, when it is desired toraise the jaw C and when the valve 'means V is shifted to a positionwhere communication is established between the ports 50 and 51 thereof.

The means F involves the single return pipe 89 which extends from theT-fitting on the reservoir, to the outlet port 50 of the valve means V.

In practice, a suitable gauge 90 can be provided in the delivery line 87so that the operator can easily and conveniently determine the pressurebeing generated and exerted onto the pipe P. y

The manually operable shifting means G that I provide is adapted toshift the jaw C vertically into and out of engagement with the pipe P',preparatory to or subsequent to operatingof the means E and P.

The means G is shown as including a projection 91 with a vertical guideopening 92 at the rear of the lower head 38 of the cylinder and pistonunit, a rearwardly extending projection 93 on the body 29 of the yoke 28of the means D to occur below the projection 91, an elongate, verticallydisposed rack 94 fixed to and projecting upwardly from the projection 93and slidably engagedin the opening 92 in the projection 91, a shaft 95extending transversely through the projection 91 and the opening 92therein and rotatably carried by the said projection, a pinion 96 on theshaft, to occur within the opening and meshed with the rack and anelongate lever arm 97, at one end of the shaft, outward of theprojection 91 and provided with a hand knob 98 at its outer terminalend.

With the means G set forth above, and when the valve means V is in aposition to allow for the free flow of fluid into and out of thecylinder and piston unit E, through the return means F, the operator ofmy new vise can easily and quickly-raise or lower the jaw C out of orinto engagement with the pipe P by simply urging the lever arm 97 oneway or the other as circumstances require. l Q

When it is desired toclamp the pipe P tight in the vise, the jaw C isfirst urged into engagement with the pipe P by the means G, the valvemeans V is next shifted to its other position, where communication isestablished between the unit E and the pump means P, then the pump meansis actuated to urge fluid under pressure into the unit E, by means ofthe lever arm 62 thereof and until the desired gripping or clampingpressure is attained.

It is to be noted that the fluid system of my construction is fullycharged at all times. As a result of the fully charged condition of thefluid system, and when the jaw C is initially engaged with the pipe bythe means G, very little fluid need be moved by the pump means P intothe unit E to create ample holding or clamping pressure on the pipe. Ithas been found that urging the lever arm 62 through approximately 45results in adequate clamping pressure on the pipe.

From the foregoing, it will be apparent that I have invented a simple,practical, highly effective and dependable hydraulically operated pipevise and a vise construction which is such that it can be easily andconveniently transported and such that it requires no special trainingor skill to operate,

Having described only a typical preferred form and application of myinvention, I do not wish to be limited or restricted to thespecificdetails herein set forth, but

.wish to reserve to myself any modifications or variations that mayappear to those skilled in the art and fall within the scope of thefollowing claims.

Having described my invention, I claim:

1. A ise 'of the character referred to including, a

frame havinglan elongate, horizontally disposed base with front and rearends, a pair of laterally spaced vertically disposed standards at therear end of the base, a second pair of laterally spaced, verticallydisposed standards at the central portion of the base, an elongate,horizontally disposed header fixed to the upper ends of the pairs ofstandards and overlying the base, a fixed jaw secured to the forwardportion of the base and having an upwardly .L'ope'ning pipe receivingtrough extending transversely of the base, an elongate arm having an endpivotally supported between the pair of standards at the rear of thebase and projecting forwardly between the second pair of standards to beguided thereby, a movable jaw spaced above and opposing the fixed jaw, ayoke pivotally carried by the arm and pivotally connected withthemovable jaw on axes extending transversely of the base, a cylinderagainst i 6 and piston unit including a cylinder sleeve with upper andlower heads, a piston in the sleeve, a rod on the piston projectingthrough the lower head and connected with the yoke, said upper headhaving a clevis thereon and pivotally connected to the header, a fluidreservoir, manually operable pump means connected with and receivingfluid from the reservoir and connected with the upper head of thecylinder and piston unit to deliver fluid into the cylinder underpressure, a return pipe extending from the upper cylinder head to thereservoir, manually operable valve means in the upper cylinder head andoperable to selectively establish communication between the cylinder andpump means and between the cylinder and the return pipe, and manuallyoperable shifting means operable to shift the movable jaw into and outof engagement with a pipe engaged in the fixed jaw preparatory to orsubsequent to operation of the pump means.

2. A vise of the character referred to including, a frame having anelongate, horizontally disposed base with front and rear ends, a pair oflaterally spaced vertically disposed standards at the rear end of thebase, a second pair of laterally spaced, vertically disposed standardsat the central portion of the base, an elongate, horizontally disposedheader fixed to the upper ends of the pairs of standards and overlyingthe base, a fixed jaw secured to the forward portion of the base andhaving an upwardly opening pipe receiving trough extending transverselyof the base, an elongate arm having an end pivotally supported betweenthe pair of standards at the rear of the base and projecting forwardlybetween the second pair of standards to be guided thereby, a movable jawspaced aboveand opposing the fixed jaw, a yoke pivotally carried by thearm and pivotally connected with the movable jaw on axes extendingtransversely of the base, a cylinder and piston unit including acylinder sleeve with upper and lower heads, a piston in the sleeve, arod on the piston projecting through the lower head and connected withthe yoke, said upper head having a clevis thereon and pivotallyconnected to the header, a fluid reservoir, manually operable pump meansconnected with and receiving fluid from the reservoir and connected withthe upper head of the cylinder and piston unit to deliver fluid into thecylinder under pressure, a return pipe exand connected with a deliverypipe extending from the reservoir, a flow port establishingcommunication between the bore and the cylinder sleeve, a valve plugrotatably engaged in the bore and having a port therein to beselectively positioned to establish communication between the flow portand the inlet port and between the flow port and the outlet port and anoperating lever arm carried by the plug at the exterior of the bore.

3. A vise of the character referred to including, a frame having anelongate, horizontally disposed base with front and rear ends, a pair oflaterally spaced vertically disposed standards at the rear end of thebase, a second pair of laterally spaced, vertically disposed, standardsat the central portion of the base, a horizontally disposed header fixedto the standards and overlying the base, a fixed jaw on the base, anelongate arm pivotally supported by the standards between the base andthe header, a movable jaw pivotally carried by the arm and opposing thefixed jaw, a reservoir, a vertically disposed cylinder and piston unitfixed to and extending between the header and the arm, manually operablepump means connected with the upper end of the cylinder and piston unitto deliver fluid into the cylinder under pressure, a return .assntatpipe extending from the upper end of the said unit to the reservoir,manually operable valve means at the upper end of the unit and operableto selectively establish communication between the unit and pump meansand between the unit and the return pipe, and manually operable shiftingmeans operable to shift the movable jaw into and out of engagement witha pipe engaged in the fixed jaw preparatory to or subsequentto operationof the pump means, said pump means including a guide block fixed to thelower end of the unit, a cylinder and ram carried ,by the block, amanually operable rack and pinion drive means carried by the block andcoupled with the ram and a flow control means having a check valvecontrolled inlet port connected with a flow pipe extending from thereservoir, a check valve controlled outlet port connected with the valvemeans by a delivery pipe and a flow port intermediate the inlet andoutlet portsand connected with the cylinder of the pumpmeans.

' 4. A vise of the character referred to including, a frame having anelongate, horizontally disposed base with front and rear ends, a pair oflaterally spaced verticallytdisposed standards at the rear end of thebase, a second pair of laterally spaced, vertically disposed standardsat the central portion of the base, an elongate, horizontally disposedheader fixedto the upper ends of the pairs of standards and overlyingthe base, a fixed jaw secured to the forward portion of the base andhaving an upwardly opening pipe receiving trough extending transverselyof the base, an elongate arm having an end pivotally supported betweenthe pair of standards at the .rear of the base and projecting forwardlybetween the second pair of standards to, beguided thereby, a movable jawspaced above and opposing the fixed jaw, a yoke pivotally carried by thearm and pivotally connected with the movable jaw on axes extendingtransversely of the base, a cylinder and piston unit including acylinder sleeve with upper and lower heads, a piston in the sleeve, arod on the piston projecting through the lower head and connected withthe yoke, said upper head having a clevis thereon and pivotallyconnected to the header, a fluid reservoir, manually operable pump meansconnected with and receiving fluid from the reservoir and connected withthe upper head of the cylinder and piston unit to deliver fluid into thecylinder under pressure, a return pipe extending from the upper cylinderhead to the reservoir, manually operable valve means in the uppercylinder head and operable to selectively establish communicationbetween the cylinder and pump means and between the cylinder and thereturn pipe, and manually operable shifting means operable to shift themovable jaw into and out of engagement with a pipe engaged in the fixedjaw preparatory to or subsequent to operation of the pump means, saidvalve means including a bore in the head, an inlet port in the headcommunicating with the bore and connected with a delivery pipe extendingfrom the reservoir, a flow port establishing communication between thebore and the cylinder sleeve a valve plug rotatably engaged in the boreand having a port therein to be selectively positioned to establishcommunication between the flow port andthe inlet port and between theflow port and the outlet port and an operating lever arm carried by theplug at the exterior of the bore, said pump means including a guide'block fixed to the lower cylinder head, a cylinder and ram carried bythe block, a manually operable rack and pinion drive means carried bythe block and coupled with the ram and a flow control valve means havinga check valve controlled inlet port connected with a flow pipe extendingfrom the reservoir, a check valve controlled outlet port connected withthe valve means in the cylinder head by a delivery pipe and a flow portintermediate the inlet and outlet portsand connected with the cylinderof the pump means. 1

5. A vise of the character referred to including, a vframe having 'anelongate, horizontally disposed base with front and rear ends, a pair oflaterally spaced vertically disposed standards at the rear end of thebase, a second pair of laterally spaced, vertically disposed standardsat the central portion of the base, anelongate, horizontally disposedheader fixed to the upper ends of the pairs of standards and overlyingthe base, a fixed jaw secured to the forward portion of the base andhaving an upwardly opening pipe receiving trough extending transverselyof the base, an elongate arm having an end pivotally supported betweenthe pair of standards at the rear of the base and projecting forwardlybetween the second pair of standards to be guided thereby, a movable jawspaced above andopposing the fixed jaw, a yoke pivotally carried by thearm and pivotally connectedwith the movable jaw 'on axes extendin'gtransversely of the base, a cylinder and piston'unit including acylinder sleeve with upper and lower heads, a piston in the sleeve, arod on the piston projecting through the lower head and connected withthe yoke, said upper head having a clevis thereon and pivotallyconnected to the header, a fluid reservoir, manually operable pump meansconnected with and receiving fluid from the reservoir and connected withthe upper head of the cylinder and piston unit to deliver fluid into thecylinder under pressure, a return pipe extending from the upper cylinderhead to the reservoir, manually operable pump means connected with andreceiving fluid from the reservoir and connected with the upper head ofthe cylinder and piston unit to deliver fluid into the cylinder underpressure, a return pipe extending from the upper cylinder head to thereservoir, manually operable valve means in the upper cylinder head andoperable to selectively establish communication between the cylinder andpump means and between the cylinder and the return pipe, and manuallyoperable shifting means operable to shift the movable jaw into and outof engagement with a pipe engaged in the fixed jaw preparatory to orsubsequent to operation of the pump means, said shifting means includingan elongate rack fixed to the yoke to extend parallel with the cylinderand piston unit, a pinion rotatably carried by the lower piston head andmeshed with the rack and an operating lever connected with the pinion.

6. A vise of the character referred to including, a frame having anelongate, horizontally disposed base with front and rear ends, a pair oflaterally spaced vertically disposed standards at the rear end of thebase, a second pair of laterally spaced, vertically disposed standardsat the central portion of the base, an elongate, horizontally disposedhcader fixed to the upper ends of the pairs of standards and overlyingthe base, a fixed jaw secured to the forward portion of the base andhaving an upwardly openaxes extending transversely of the base, acylinder and piston unit including a cylinder sleeve with upper andlower heads, a piston in the sleeve, a rod on the piston projectingthrough the lower head and connected with the yoke, said upper headhaving a clevis thereon and pivotally connected to the header, a fluidreservoir,'manually operable pump means connected with and receivingfluid from the reservoir and connected with the upper head of thecylinder and piston unit to deliver fluid into the cylinder underpressure, a return pipe extending from the upper cylinder head to thereservoir, manually operable valve means in the upper cylinder head andoperable toselectively establish communication between the cylinder andpump means and between the'cylirider and the return pipe, and manuallyoperable shifting means operable to shift the movable jaw into and outof engagement with a pipe engaged in the fixed jaw preparatory to orsubsequent to operation of the pump means, said valve means including abore in the head, an inlet port in the head communicating with the boreand connected with a delivery pipe extending from the reservoir, a flowport establishing communication between the bore and the cylindersleeve, a valve plug rotatably engaged in the bore and having a porttherein to be selectively positioned to establish communication betweenthe flow port and the inlet port and between the flow port and theoutlet port and an operating lever arm carried by the plug at theexterior of the bore, said shifting means including an elongate rackfixed to the yoke to extend parallel with the cylinder and piston unit,a pinion rotatably carried by the lower piston head and meshed with therack and an operating lever connected with the pinion.

7. A vise of the character referred to including, a frame having anelongate, horizontally disposed base with front and rear ends, a pair oflaterally spaced vertically disposed standards at the rear end of thebase, a second pair of laterally spaced, vertically disposed standardsat the central portion of the base, a reservoir, a horizontally disposedheader fixed to the upper ends of the standards and overlying the base,an elongate arm pivotally carried by the standards between the base andthe header, a fixed jaw carried by the base, a movable jaw pivotallycarried by the arm and opposing the fixed jaw, a cylinder and pistonunit fixed to and extending between the header and the arm, said unithaving upper and lower heads, manually operable pump means connectedwith the upper head of the cylinder and piston unit to deliver fluidinto the unit under pressure, a return pipe extending from the uppercylinder head to the reservoir, manually operable valve means in theupper head and operable to selectively establish communication betweenthe cylinder and pump means and between the unit and the return pipe,and manually operable shifting means operable to shift the movable jawinto and out of engagement with a pipe engaged in the fixed jawpreparatory to or subsequent to operation of the pump means, said pumpmeans including a guide block fixed to the lower cylinder head, acylinder and ram carried by the block, a manually operable rack andpinion drive means carried by the block and coupled with the ram and aflow control valve means having a check valve controlled inlet portconnected with a flow pipe extending from the reservoir, a check valvecontrolled outlet port connected with the valve means in the cylinderhead by a delivery pipe and a flow port intermediate the inlet andoutlet ports and connected with the cylinder of the pump means, saidshifting means including an elongate rack fixed to the yoke to extendparallel with the cylinder and piston unit, a pinion rotatably'carriedby the lower piston head and meshed with the rack and an operating leverconnected with the pinion.

8. A vise of the character referred to including, a frame having anelongate, horizontally disposed base with front and rear ends, a pair oflaterally spaced vertically disposed standards at the rear end of thebase, a second pair of laterally spaced, vertically disposed standardsat the central portion of the base, an elongate, horizontally dis- 10posed header fixed to the upper ends of the pairs of standards andoverlying the base, a fixed jaw secured to the forward portion of thebase and having an upwardly open ing pipe receiving trough extendingtransversely of the base, an elongate arm having an end pivotallysupported between the pair of standards at the rear of the base andprojecting forwardly between the second pair of standards to be guidedthereby, a movable jaw spaced above and opposing the fixed jaw, a yokepivotally carried by the arm and pivotally connected with the movablejaw on axes extending transversely of the base, a cylinder and pistonunit including a cylinder sleeve with upper and lower heads, a piston inthe sleeve, a rod on the piston projecting through the lower head andconnected with the yoke, said upper head having a clevis thereon andpivotally connected to the header, a fluid reservoir, manually operablepump means connected with and receiving fluid from the reservoir andconnected with the upper head of the cylinder and piston unit to deliverfluid into the cylinder under pressure, a return pipe extending from theupper cylinder head to the reservoir, manually operable valve means inthe upper cylinder head and operable to selectively establishcommunication between the cylinder and pump means and between thecylinder and the return pipe, and manually operable shifting meansoperable to shift the movable jaw into and out of engagement with a pipeengaged in the fixed jaw preparatory to or subsequent to operation ofthe pump means, said valve means including a bore in the head, an inletport in the head communicating with the bore and connected with adelivery pipe extending from the reservoir, a flow port establishingcommunication between the bore and the cylinder sleeve, a valve plugrotatably engaged in the bore and having a port therein to beselectively positioned to establish communication between the fiow portand the inlet port and between the flow port and the outlet port and anoperating lever arm carried by the plug at the exterior of the bore,said pump means including a guide block fixed to the lower cylinderhead, a cylinder and ram carried by the block, a manually operable rackand pinion drive means carried by the block and coupled with the ram andV a flow control valve means having a check valve controlled inlet portconnected with a flow pipe extending from the reservoir, a check valvecontrolled outlet port connected with the valve means in the cylinderhead by a delivery pipe and a flow port intermediate the inlet andoutlet ports and connected with the cylinder of the pump means, saidshifting means including an elongate rack fixed to the yoke to extendparallel with the cylinder and piston unit, a pinion rotatably carriedby the lower piston head and meshed with the rack and an operating leverconnected with the pinion.

References Cited in the file of this patent UNITED STATES PATENTS1,270,667 Smith June 25, 1918 2,327,920 Moohl Aug. 24, 1943 2,365,151Solomon Dec. 19, 1944

